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vmalloc() heavy workloads in UML are extremely slow, due to flushing the entire kernel VM space (flush_tlb_kernel_vm()) on the first segfault. Implement flush_cache_vmap() to avoid that, and while at it also add flush_cache_vunmap() since it's trivial. This speeds up my vmalloc() heavy test of copying files out from /sys/kernel/debug/gcov/ by 30x (from 30s to 1s.) Signed-off-by: Johannes Berg <johannes.berg@intel.com> Acked-By: Anton Ivanov <anton.ivanov@cambridgegreys.com> Signed-off-by: Richard Weinberger <richard@nod.at>
9 lines
257 B
C
9 lines
257 B
C
#ifndef __UM_ASM_CACHEFLUSH_H
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#define __UM_ASM_CACHEFLUSH_H
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#include <asm/tlbflush.h>
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#define flush_cache_vmap flush_tlb_kernel_range
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#define flush_cache_vunmap flush_tlb_kernel_range
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#include <asm-generic/cacheflush.h>
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#endif /* __UM_ASM_CACHEFLUSH_H */
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